| 摘要 |
An apparatus and method for performing a high-speed operation in a hyperelliptic curve cryptography process are provided. If a standard divisor having a weight equal to a genus g in the hyperelliptic curve cryptography of genus g is a target divisor of scalar multiplication, a determination as to whether the standard divisor is divisible into a theta divisor defined as a divisor having a weight less than the genus g is determined, and if the standard divisor is divisible, the theta divisor is generated by dividing the standard divisor, and a scalar multiplication executing block performs the scalar multiplication using the theta divisor. With this arrangement, the scalar multiplication is performed at high speed with an amount of calculation reduced, and a high-speed encryption processing operation is thus performed.
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